[LU-15456] deadlock in ll_new_node() when running racer

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.15.0
• Affects Version/s: Lustre 2.14.0, Lustre 2.15.0
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Lai Siyao

Description

ll_new_node() will call ll_dir_getstripe() to fetch parent default LMV if md_create() returns -EREMOTE, but it doesn't call ll_finish_md_op_data() to unlock lli_lsm_sem before ll_dir_getstripe(), which will cause deadlock because the ll_dir_getstripe() will lock lli_lsm_sem again.